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Topic: Ore grade

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	Ore grade - Wikipedia, the free encyclopedia
		Ore grade is a measure that describes the concentration of a valuable natural material (such as metals or minerals) in its surrounding ore.
		Ore grade is used to assess the economic feasibility of a mining operation: the cost of extracting a natural material from its ore is directly related to its concentration, and the cost of extraction must be less than the market value of the material being mined for the operation to be economically feasible.
		Ore grades are usually expressed as an amount of material per ton (or tonne) of ore. The ore grade required for economic feasibility varies widely based on the value of the material being mined.
	en.wikipedia.org /wiki/Ore_grade (175 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Ore minerals are Au, pyrite, chalcopyrite, pyrrhotite, magnetite, and native Pb, and minor galena and bornite.
		The ore mineral is mainly magnetite with minor pyrite, pyrrhotite, and chalcopyrite, and trace hematite, limonite, pseudomorphs of hematite, chalcocite, and marcasite.
		Sills of gabbro, diorite and lamprophyre intrude the limestone.
	geopubs.wr.usgs.gov /open-file/of03-220/DATABASE/lode_deposits.txt (20801 words)

	Ore grade
		The grade of precious metal ore is usually measured in troy ounces per tonne or grams per tonne.
		The grade of ore bearing other metals is usually a percentage (the weight for weight proportion of metal in the ore).
		Mill head grade is the grade of mined ore fed into a mill, as opposed to the grade of the ore mined.
	moneyterms.co.uk /ore-grade (142 words)

	The Transport System for High Grade McArthur River Uranium Ore
		Ore is mined 24 hours a day, although the production rate may be intermittent depending on the sequencing of the mining machines.
		From the storage pachucas the ore is pumped via an ore mix tank to a 12 m diameter load-out thickener, which provides a consistently high solids content in the ore slurry, thereby minimising shipment of water to Key Lake.
		McArthur River ore slurry is withdrawn from the ore storage pachucas and pumped to the neutral thickener underflow tank.
	www.world-nuclear.org /sym/1998/rosner.htm (4473 words)

	Nuclear Decommissioning - Monument Valley (Monument #2 Upgrader) Mill
		Ore is also present locally in the upper few feet of the Moenkopi and De Chelly Member (Early Permian) beds where either unit and the Shinarump ore-bearing channel strata are in contact.
		The uranium-bearing ores in the Shinarump beds are described, based on metal content, as either vanadium-uranium ore, copper-uranium ore, or uranium ore containing minor amounts of vanadium and copper.
		In its early years, the openpit yielded both higher grade ore along with considerable low grade ore. Later, the openpit yielded only low grade ore. Mined high grade ore was shipped directly to a mill, while low grade ore was stockpiled onsite for later processing to concentrate the uranium and vanadium values.
	www.eia.doe.gov /cneaf/nuclear/page/umtra/monument_valley_title1.html (1789 words)

	Sterlite Gold Limited - Glossary - Tue Oct 31, 2006
		GRADE: The amount of metal in each ton of ore, expressed as troy ounces per ton or grams per tonne for precious metals and as a percentage for most other metals.
		The location, quantity, grade, geological characteristics and continuity of a mineral resource are known, estimated or interpreted from specific geological evidence and knowledge.
		An indicated mineral resource is that part of a mineral resource for which quantity, grade or quality, densities, shape and physical characteristics can be estimated with a level of confidence sufficient to allow the appropriate application of technical and economic parameters, to support mine planning and evaluation of the economic viability of the deposit.
	www.sterlitegold.com /s/Glossary.asp (815 words)

	Cleveland-Cliffs Inc: Mining Operations and Technology (Site not responding. Last check: 2007-11-04)
		When magnetite ore is processed, the finely ground ore slurry passes over drum separators where large magnets attract the fine iron particles.
		The dewatered iron ore concentrate called "filter cake" must be put in a form suitable for shipping and for use in blast furnaces at steel mills.
		The powdery iron ore concentrate is mixed with a small amount of a clay binder called "bentonite" and rolled into marble-sized pellets called "green balls" in balling drums.
	www.cleveland-cliffs.com /mining/flow.asp (496 words)

	The McArthur River Project: High Grade Uranium Mining
		Not only is the high grade of the uranium ore challenging, but solutions must also be found to deal with groundwater at very high pressures, and ground conditions that vary substantially from excellent to wholly unconsolidated clays and gravels.
		This programme was aimed at determining the shape, grade and continuity of the central part of the ore body, on a strike length of 300 m.
		The two ore slurry hoisting pumps are of positive displacement type, and are each connected to a dedicated pipeline to convey the ore slurry directly to the surface.
	www.world-nuclear.org /sym/1997/jamieson.htm (4136 words)

	Ferroelectricity in Ore Minerals
		While twenty ore minerals are presently recognized as ferroelectrics (Table 1), it is also possible to predict other ore minerals that may be ferroelectric by extrapolation from known characteristics.
		Sixty-six ore minerals that are isostructural with the known ferroelectric minerals in Table 1 have been identified.
		With twenty known ferroelectric ore minerals and sixty-six minerals isostructural with the known ferroelectrics, ferroelectricity should be regarded as a common property of ore minerals.
	corry.ws /CorryBook-5.htm (3442 words)

	Mining Technology - Homestake Gold Mine - Ruby Hill - Nevada
		High grade ore was processed in a conventional mill and leach plant.
		Mercury contained in the ore and reporting to solution during cyanidation is recovered in a mercury scrubber, or from the retort condenser.
		Ore being stockpiled from the secondary crusher (low-grade ore).
	www.mining-technology.com /projects/rubyhill (714 words)

	McArthur River Uranium
		Besides these high grade ore zones, there is the Quartzite ore zone, adjacent to the Pelite ore. Lower grade, at 1-2% U308 it has, as yet, not been well defined by drilling.
		Ore is also found along P2 Fault and has been subdivided as P2 Nose ore and PS Fault ore. The surface drilling consisted of very few holes so Cameco considers the potential to discover additional uranium to be excellent.
		The ore receiving plant at Key Lake provides remotely controlled handling of the ore containers, vehicle and container washing, storage for empty containers, ore slurry storage and a pump to move the ore slurry to the blending areas.
	www.coffey.com /~wma/uranium/mining/art138.htm (3026 words)

	Iron IV (Site not responding. Last check: 2007-11-04)
		Natural ore bodies varied considerably in composition from place to place, and these differences had to be dealt with in the smelting (i.e., in the steel mill) by adding various ingredients to remove the undesired constituents.
		A wooden ore dock was built in 1896 in Presque Isle Harbor, Marquette, of the latest type of construction for that period.
		Michigan iron ore mining declined in the 1920s and 1930s, but its reactivation with the development of new processes in the 1950s and Escanaba’s proximity to Chicago’s steel industry have kept iron ore exportation an integral part of the city’s economy.
	www.geo.msu.edu /geo333/iron_iii.html (3909 words)

	Alcoa in Australia: Careers: Vacancies (Site not responding. Last check: 2007-11-04)
		This encompasses the development of ore reserves, the maintenance of stockpile bauxite quality, and the preparation of the various reports resultant from investigations and studies.
		The identification and description of the bauxite ore bodies is essential to both short term and long term mining and refining operations.
		Detailed mapping is necessary to identify areas within an ore deposit which have potential grade control ore mine scheduling problems associated with their geological characteristics.
	www.alcoa.com /australia/en/careers/vacancies/20051205_Geologist.asp (644 words)

	Taconite - Digging into MN Minerals: Minnesota DNR (Site not responding. Last check: 2007-11-04)
		Taconite is a low-grade iron ore. When the high-grade natural iron ore was plentiful, taconite was considered a waste rock and not used.
		The rock is mixed with water and ground in rotating mills until it is as fine as powder.
		The iron ore is separated from the taconite using magnetism.
	www.dnr.state.mn.us /education/geology/digging/taconite.html (434 words)

	CSIRO - New fast sensors to revive ore sorting
		Sorting ore particles before processing can cut downstream costs, limit environmental harm by reducing mine wastes and improve ore quality and mineral recovery.
		"As higher grade ore reserves are gradually depleted or become harder to locate, mining companies are having to mine lower-grade ore," says Dr Nick Cutmore, project leader of the CSIRO team developing the sensors.
		The ore sorting team is just one of many research teams in CSIRO that are working on mineral analysis technologies.
	www.csiro.au /files/mediaRelease/mr2001/OreSorting.htm (521 words)

	[No title]
		The ore was poured in a steady and even stream from the top of a narrow, hollow tower and fell past 480 electromagnets, each twelve inches wide and six feet long, which tugged at the iron granules just enough so that they fell to one side of a partition at the bottom.
		Since phosphorous compounds in the ore made a finer dust than the magnetite, Edison tried using a gentle air current to blow them in a separate receptacle, where they were collected and sold for use in paints.
		The powdered ore was mixed with water, and then a glue was stirred in; the result, which looked like modeling clay, was injected under pressure into small round molds and fired to a rock hard consistency.
	www.rpi.edu /locker/82/000882/smti10_1.html (3937 words)

	Low-grade uranium dumped in North Woburn
		It is the high-grade ore, called pitchblende, which is largely mined to extract reactor and weapons grade uranium).
		If the ore was not moved from the location of the old dump on New Boston Street, there is a very slight chance that an industrial building may be sitting on top of it.
		The uranium ore in question, particularly if it is spread out over an area of either the old dump site or the new dump in North Woburn, is not likely to approach those levels of exposure at all.
	www.northshoreonline.com /woburn/radio-1.htm (1833 words)

	SQRA for Ore Control
		This approximation assumes that the ore is easy to sample because the gold is evenly distributed in the rock, as individual atoms.
		In this case, the liberation of the gold may be approximated by spherical particles with a liberation size of 3 angstroms or 0.00000003 cm.
		The grade zone used for probability calculation is limited to a 5%-95% probability, for purposes of simplicity, and outside this grade zone ore and waste probability values of 0 and 1 are used.
	www.bucknam.com /sqra.html (1312 words)

	Ore Milling - The Edison Papers (Site not responding. Last check: 2007-11-04)
		In this device, sand from tailings or crushed rock was poured through a hopper so that it fell in a thin, broad stream in front of an electromagnet that attracted magnetic particles, such as iron, into one receptacle while non-magnetic particles fell straight through into another bin.
		His first ore venture involved the concentration of iron found in fl sand during the early 1880s, but his more important effort took place between 1887 and 1898 when he designed a whole system of mining, crushing, separating, and concentrating the ore into briquettes at a mine in northern New Jersey.
		After pouring over $2 million of his own money into this venture, Edison was forced to abandon it when the discovery of large iron ore deposits in the Great Lake region made Edison's concentrated low-grade ore too expensive for steel mills.
	edison.rutgers.edu /ore.htm (208 words)

	PRESS RELEASE Goldcorp Completes Los Filos Feasibility Study (Site not responding. Last check: 2007-11-04)
		Higher grade ore from within the Los Filos deposit will be crushed to 19mm and agglomerated before being conveyor stacked and heap leached.
		Lower grade ore from Los Filos and El Bermejal deposits will be hauled from the open pit directly to the leach pad to be bulk heap leached.
		The strategic aim of the project is to continue developing further ore volume and higher grade ore from Los Filos, El Bermejal, and the neighboring Nukay district that will justify a new conventional milling operation in parallel with the heap leaching operation.
	www.marketwire.com /mw/release_html_b1?release_id=0124089 (1178 words)

	Queenstake Expands Resources and Increases Ore Grade at Starvation Canyon : ArriveNet Press Releases : Industry (Site not responding. Last check: 2007-11-04)
		This represents an increase of 16% in contained ounces as well as an increase in grade of 9% compared to the year-end 2004 estimate.
		The estimated grade increase from 0.271 opt in 2004 to 0.294 opt is very encouraging.
		SSX-Steer production is expected to ramp up from 1,140 ore tons per day in the third quarter to steady state rate of 1,950 ore tons per day in the first quarter of 2006.
	press.arrivenet.com /industry/article.php/698784.html (1967 words)

	Ore House (Site not responding. Last check: 2007-11-04)
		This bizarre looking structure was built by the Goldstone Consolidated Mining Company (not one of their more stunning architectural achievements) to store sacks of high grade ore waiting to be shipped.
		They used to store the ore sacks in the Goldstone Railroad's public freight house, but too much of it was mysteriously disappearing.
		High grade ore is ore that contains a higher density of gold or silver thereby making it worthwhile to pay to have it shipped to distant, more efficient smelters.
	home.att.net /~Goldstone2/Ore_House.html (412 words)

	Tungabhadra Minerals Private Ltd.
		Tungabhadra Minerals Private Limited is a well established mining company widely regarded for its consistency and reliability in the production of various types of iron ore such as super and basic grade lumps, calibrated ore, high grade/low grade fines and high density iron ore aggregates for export as well as home trade.
		The mined ore is supplied to the Metal & Mineral Trading Corporation India Limited, Pig Iron plants and Off-shore pipe coating plants in the form of lumpy ore, high grade fines, sinter feed fines, pellet feed fines, calibrated ore, and iron ore concentrates.
		Tungabhadra Minerals is on the forefront of mining in India and their intensive and pioneering research keeps them abreast of all leading edge activities in the offshore oil industry.
	www.tml.co.in /about.htm (319 words)

	GridORE
		The blocks can be coloured/patterned according to grade, ore body number or other fields.
		Summaries of tonnage, grade, value etc. classified by ore body or mining phase.
		The blocks are coloured according to gold grade and are labelled with the mining phase number.
	ourworld.compuserve.com /homepages/JohnDavis/gridore.htm (608 words)

	Sonora Gold Receives Ore Grade Molybdenum-Copper Drill Intervals From San Enrique and Additional High Grade Gold ... (Site not responding. Last check: 2007-11-04)
		The mineralization is in the form of molybdenite, chalcopyrite, chalcocite, and minor secondary copper minerals and galena and sphalerite.
		The results received to date and, to a certain extent, current metal prices, dictate that the focus of exploration at San Enrique switch from gold to molybdenum/copper, either lower grade bulk tonnage targets or higher grade supergene zones.
		The values received in Hole # 05-15 are considered "ore grade" under any metal price scenario, past or present and the exploration will focus on finding additional similar drill intervals.
	press.arrivenet.com /industry/article.php/577439.html (1211 words)

	Oregon Agriculture in the Classroom Foundation (Site not responding. Last check: 2007-11-04)
		Calendar Contest - The contest is open to students in grades K-6.
		The FFA members collected over 70,000 lbs of food in their annual food drive and partnered with their “elementary buddies” to put together packages of food for families in need.
		FFA members conducted tours and taught the young students about the different animals, nutrition and their purposes in agriculture.
	aitc.oregonstate.edu /events (823 words)

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